Possible CIFS bug - open one file, get another

Hi folks.

I have what may be an in-kernel CIFS filesystem bug.

It seems that if I open a specific file, I get the contents of a different file back.

This may or may not have security implications.

Oddly, if I read the file with the same code in CPython 2.x, CPython 3.x or Pypy (recent trunk), I see the error. But if I run exactly the same code on Jython 2.5.x, it works fine.

Also, if I reboot, things work OK for a while.

And if I umount+mount, that works too.

I ran across the issue, because I have a backup program I've been writing for fun, and it saves the same timestamp inside a file, and in its filename. When I assert that the two are the same within some smallish tolerance, the assertion sometimes fails, as described above.

Is there a bugtracker somewhere that such an issue should go into?

Has this already been fixed in later kernels?

I'm on Linux Mint 12, kernel 3.0.0-12-generic.

Thanks!

A network trace such as from wireshark or netmon (e.g. attached to a bug report) would help - as it would let us compare a working and failing scenario and see if the client is sending the wrong file name or the server is opening the wrong file in response to a request to open the correct file.

There is additional information at
http://wiki.samba.org/index.php/LinuxCIFS_troubleshooting

Thanks,

Steve